7 lines (6 with data), 255 Bytes

m069b 0 128 0 11:40:00 20/03/1989
# Start time=11:40
# First beat=11:46:49.500
# <age-range>: 45-49, <sex>: Female, <medication>: Moricizine
# <RR-low-limit(sec)>: 0.437,  <RR-high-limit(sec)>: 0.89
# Note: reel-to-reel recording, not flutter-compensated